TRIPLE VALVES 



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triple valve, which accounts for the ports extending from the 

 safety-valve chamber to the check-valve-case face. It is not 

 necessary to plug this end of the ports, because the check- 

 valve-case gasket blanks the ends of the ports. 



FIG. 3 



Fig. 3. is a diagrammatic view of the triple valve showing the 

 positions the parts assume in full-release and charging positions. 



OPERATION OF LN EQUIPMENT 



Charging Position. When the brake pipe is first charged, 

 brake-pipe air will pass through the passages into chamber H 

 and move the main piston 4 to the right to full-release position, 

 provided it is not already in that position. This movement opens 

 the feed-groove and allows brake-pipe air to pass into cham- 

 ber R and the auxiliary reservoir. The slide and graduating 



